Al-Zn-Mg合金の水素脆化発生の支配因子

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  • 戸田 裕之
    九州大学大学院工学研究院機械工学部門
  • 平山 恭介
    九州大学大学院工学研究院機械工学部門 京都大学大学院工学研究科材料工学専攻
  • 山口 翔吾
    九州大学大学院工学研究院機械工学部門
  • 藤原 比呂
    九州大学大学院工学研究院機械工学部門
  • 比嘉 良太
    九州大学大学院工学研究院機械工学部門
  • 清水 一行
    岩手大学理工学部物理・材料理工学科
  • 竹内 晃久
    公益財団法人高輝度光科学研究センター
  • 上椙 真之
    公益財団法人高輝度光科学研究センター

書誌事項

タイトル別名
  • Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy
  • Al-Zn-Mg ゴウキン ノ スイソゼイカ ハッセイ ノ シハイ インシ

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<p>The surrogate-based microstructural optimization was applied to describe the relationship between local crystallographic microstructure and intergranular hydrogen embrittlement in an Al-Zn-Mg alloy. The support vector machine with an infill sampling criterion was used to realise high-accuracy optimisation with a limited size of data set. The methodology integrates thoroughgoing microstructural quantification, a couple of coarsening processes and the surrogate modelling. An objective function was defined together with 66 design parameters, which quantitatively express the size, shape, orientation and damage during specimen machining for surface grain boundaries and grains. The number of design parameters was then reduced from 66 to 3 during the two-step coarsening process. It has been clarified that intergranular crack initiation is described using the simple size of grains and grain boundaries together with grain boundary orientation with respect to the loading direction. It can be inferred that those design parameters are of crucial importance for crack initiation through the elevation in stress normal to grain boundaries. Correlation between the selected design parameters and crack initiation was rather weak compared to the past application of a similar technique to particle damage. The reason for this was discussed. The present approach offers a cost-efficient solution for the prevention of hydrogen embrittlement through 3D design of crystallographic microstructure, which cannot be obtained with the conventional approaches for developing materials.</p><p> </p><p>Mater. Trans. 64 (2023) 2729-2738に掲載</p>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 88 (3), 39-47, 2024-03-01

    公益社団法人 日本金属学会

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